The group method was useful in this research, not only because it made possible a material saving in the time of the subjects, but it required all of the men to be on time; it provided a suitable occasion for announcements and general instructions in procedure, and it also gave a period for quiet work and adjustment of mental attitude before the individual measurements were begun. Immediately after the standard evening meal (see p. 59) in a nearby restaurant, the men came to the Nutrition Laboratory. The group tests were made in the library. This room is 16 by 27 feet, with ceiling 11 feet high, and was well suited for a group experiment with a squad of 12 men; the lighting was direct from three clusters at the ceiling arranged lengthwise of the table. These clusters were supplied with Mazda and nitrogen-filled lamps and no one complained of the lighting at any time except Can, whose eyes were rather weak and who thought the light was too brilliant. The table at which the men worked was 16 feet long and 4 feet wide; no objects other than the pencils and the paper blanks to be used by the subjects were on the table. The men were arranged 6 on either side of the table. At the first session seats were assigned and each man occupied his particular seat at the subsequent sessions when he was present, although it was not believed that one location in the room was more favorable than another for the group experiments. A considerable period was allowed for preliminary adjustments, announcements, questions, and a general quieting of the men before beginning the evening session. In the following paragraphs the measurements given by the group method will be described in the order in which they were used each evening. This order was never varied.